The hunt for more than 250 people suspected of taking part in the Rwandan genocide has been bolstered by the arrest of one of the alleged masterminds of the atrocity.

Surveillance operations against Félicien Kabuga’s 11 children in Britain, France and Belgium led to his discovery in Asnières-sur-Seine, a smart inner suburb of Paris. Éric Émeraux, the head of the Central Office for Combating Crimes Against Humanity, said officers that took advantage of the lockdown to track relatives.

Mr Kabuga, who is now 84 and in a wheelchair, offered no resistance when officers went to his door last Saturday. Once one of Rwanda’s richest men, he is accused of bankrolling the 100 days of slaughter — including by importing hundreds of thousands of machetes to